等离子体拓展氨/空气预混旋流火焰贫燃极限  

Plasma-Extended Lean Blowout Limit of Ammonia/air Premixed Swirl Flame

作　　者：王宇 孔成栋 乌晓江 张忠孝[1] Wang Yu;Kong Chengdong;Wu Xiaojiang;Zhang Zhongxiao(Institute of Thermal Engineering,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学机械与动力工程学院热能工程研究所,上海200240

出　　处：《燃烧科学与技术》2024年第5期457-465,共9页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(52006138);上海市浦江人才计划资助项目(20PJ1407300).

摘　　要：为探究等离子体对氨-空气预混旋流火焰贫燃极限及燃烧效率的影响规律,将等离子体等效为热源,结合计算流体力学(CFD)燃烧模拟手段分析不同当量比及等离子体放电位置下氨的燃烧特性.结果发现,布置等离子体等效热源后,氨-空气贫燃极限从0.82降至0.78以下,但同时伴随燃烧效率的下降.其原因主要在于等离子体放电输入热量可维持局部高温来防止火焰吹熄并提高局部火焰传播速度.然而,随当量比下降等离子体作用范围减小,导致部分氨逃逸进而引起燃烧不充分及燃烧效率下降.In order to explore the plasma-extended lean blowout(LBO)limit of ammonia/air premixed swirl flame,the combustion characteristics of ammonia are analyzed under different equivalence ratios and locations of plasma source by computational fluid dynamics(CFD)combustion simulation.The results show that the LBO limit of ammonia/air premixed flame drops from 0.82 to 0.78 and below under the excitation of plasma heat source.However,the combustion efficiency decreases as the equivalence ratio decreases.It can be attributed to the fact that the local high-temperature environment provided by plasma discharge can prevent flame from blowing out and improve the local flame propagation speed.As the equivalence ratio decreases,the effective volume of plasma source shrinks,resulting in the escape of ammonia and the reduction of combustion efficiency.

关 键 词：等离子体助燃 氨燃烧 贫燃极限 燃烧效率 

分 类 号：O53[理学—等离子体物理] TM8[理学—物理] TK5[电气工程—高电压与绝缘技术]